arch/x86/boot/compressed/eboot.c

   1 /* -----------------------------------------------------------------------
   2  *
   3  *   Copyright 2011 Intel Corporation; author Matt Fleming
   4  *
   5  *   This file is part of the Linux kernel, and is made available under
   6  *   the terms of the GNU General Public License version 2.
   7  *
   8  * ----------------------------------------------------------------------- */
   9
  10 #include <linux/efi.h>
  11 #include <linux/pci.h>
  12 #include <asm/efi.h>
  13 #include <asm/setup.h>
  14 #include <asm/desc.h>
  15
  16 #include "../string.h"
  17 #include "eboot.h"
  18
  19 static efi_system_table_t *sys_table;
  20
  21 static struct efi_config *efi_early;
  22
  23 __pure const struct efi_config *__efi_early(void)
  24 {
  25         return efi_early;
  26 }
  27
  28 #define BOOT_SERVICES(bits)                                             \
  29 static void setup_boot_services##bits(struct efi_config *c)             \
  30 {                                                                       \
  31         efi_system_table_##bits##_t *table;                             \
  32                                                                         \
  33         table = (typeof(table))sys_table;                               \
  34                                                                         \
  35         c->boot_services = table->boottime;                             \
  36         c->text_output = table->con_out;                                \
  37 }
  38 BOOT_SERVICES(32);
  39 BOOT_SERVICES(64);
  40
  41 void efi_char16_printk(efi_system_table_t *, efi_char16_t *);
  42
  43 static efi_status_t
  44 __file_size32(void *__fh, efi_char16_t *filename_16,
  45               void **handle, u64 *file_sz)
  46 {
  47         efi_file_handle_32_t *h, *fh = __fh;
  48         efi_file_info_t *info;
  49         efi_status_t status;
  50         efi_guid_t info_guid = EFI_FILE_INFO_ID;
  51         u32 info_sz;
  52
  53         status = efi_early->call((unsigned long)fh->open, fh, &h, filename_16,
  54                                  EFI_FILE_MODE_READ, (u64)0);
  55         if (status != EFI_SUCCESS) {
  56                 efi_printk(sys_table, "Failed to open file: ");
  57                 efi_char16_printk(sys_table, filename_16);
  58                 efi_printk(sys_table, "\n");
  59                 return status;
  60         }
  61
  62         *handle = h;
  63
  64         info_sz = 0;
  65         status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
  66                                  &info_sz, NULL);
  67         if (status != EFI_BUFFER_TOO_SMALL) {
  68                 efi_printk(sys_table, "Failed to get file info size\n");
  69                 return status;
  70         }
  71
  72 grow:
  73         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
  74                                 info_sz, (void **)&info);
  75         if (status != EFI_SUCCESS) {
  76                 efi_printk(sys_table, "Failed to alloc mem for file info\n");
  77                 return status;
  78         }
  79
  80         status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
  81                                  &info_sz, info);
  82         if (status == EFI_BUFFER_TOO_SMALL) {
  83                 efi_call_early(free_pool, info);
  84                 goto grow;
  85         }
  86
  87         *file_sz = info->file_size;
  88         efi_call_early(free_pool, info);
  89
  90         if (status != EFI_SUCCESS)
  91                 efi_printk(sys_table, "Failed to get initrd info\n");
  92
  93         return status;
  94 }
  95
  96 static efi_status_t
  97 __file_size64(void *__fh, efi_char16_t *filename_16,
  98               void **handle, u64 *file_sz)
  99 {
 100         efi_file_handle_64_t *h, *fh = __fh;
 101         efi_file_info_t *info;
 102         efi_status_t status;
 103         efi_guid_t info_guid = EFI_FILE_INFO_ID;
 104         u64 info_sz;
 105
 106         status = efi_early->call((unsigned long)fh->open, fh, &h, filename_16,
 107                                  EFI_FILE_MODE_READ, (u64)0);
 108         if (status != EFI_SUCCESS) {
 109                 efi_printk(sys_table, "Failed to open file: ");
 110                 efi_char16_printk(sys_table, filename_16);
 111                 efi_printk(sys_table, "\n");
 112                 return status;
 113         }
 114
 115         *handle = h;
 116
 117         info_sz = 0;
 118         status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
 119                                  &info_sz, NULL);
 120         if (status != EFI_BUFFER_TOO_SMALL) {
 121                 efi_printk(sys_table, "Failed to get file info size\n");
 122                 return status;
 123         }
 124
 125 grow:
 126         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 127                                 info_sz, (void **)&info);
 128         if (status != EFI_SUCCESS) {
 129                 efi_printk(sys_table, "Failed to alloc mem for file info\n");
 130                 return status;
 131         }
 132
 133         status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
 134                                  &info_sz, info);
 135         if (status == EFI_BUFFER_TOO_SMALL) {
 136                 efi_call_early(free_pool, info);
 137                 goto grow;
 138         }
 139
 140         *file_sz = info->file_size;
 141         efi_call_early(free_pool, info);
 142
 143         if (status != EFI_SUCCESS)
 144                 efi_printk(sys_table, "Failed to get initrd info\n");
 145
 146         return status;
 147 }
 148 efi_status_t
 149 efi_file_size(efi_system_table_t *sys_table, void *__fh,
 150               efi_char16_t *filename_16, void **handle, u64 *file_sz)
 151 {
 152         if (efi_early->is64)
 153                 return __file_size64(__fh, filename_16, handle, file_sz);
 154
 155         return __file_size32(__fh, filename_16, handle, file_sz);
 156 }
 157
 158 efi_status_t
 159 efi_file_read(void *handle, unsigned long *size, void *addr)
 160 {
 161         unsigned long func;
 162
 163         if (efi_early->is64) {
 164                 efi_file_handle_64_t *fh = handle;
 165
 166                 func = (unsigned long)fh->read;
 167                 return efi_early->call(func, handle, size, addr);
 168         } else {
 169                 efi_file_handle_32_t *fh = handle;
 170
 171                 func = (unsigned long)fh->read;
 172                 return efi_early->call(func, handle, size, addr);
 173         }
 174 }
 175
 176 efi_status_t efi_file_close(void *handle)
 177 {
 178         if (efi_early->is64) {
 179                 efi_file_handle_64_t *fh = handle;
 180
 181                 return efi_early->call((unsigned long)fh->close, handle);
 182         } else {
 183                 efi_file_handle_32_t *fh = handle;
 184
 185                 return efi_early->call((unsigned long)fh->close, handle);
 186         }
 187 }
 188
 189 static inline efi_status_t __open_volume32(void *__image, void **__fh)
 190 {
 191         efi_file_io_interface_t *io;
 192         efi_loaded_image_32_t *image = __image;
 193         efi_file_handle_32_t *fh;
 194         efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
 195         efi_status_t status;
 196         void *handle = (void *)(unsigned long)image->device_handle;
 197         unsigned long func;
 198
 199         status = efi_call_early(handle_protocol, handle,
 200                                 &fs_proto, (void **)&io);
 201         if (status != EFI_SUCCESS) {
 202                 efi_printk(sys_table, "Failed to handle fs_proto\n");
 203                 return status;
 204         }
 205
 206         func = (unsigned long)io->open_volume;
 207         status = efi_early->call(func, io, &fh);
 208         if (status != EFI_SUCCESS)
 209                 efi_printk(sys_table, "Failed to open volume\n");
 210
 211         *__fh = fh;
 212         return status;
 213 }
 214
 215 static inline efi_status_t __open_volume64(void *__image, void **__fh)
 216 {
 217         efi_file_io_interface_t *io;
 218         efi_loaded_image_64_t *image = __image;
 219         efi_file_handle_64_t *fh;
 220         efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
 221         efi_status_t status;
 222         void *handle = (void *)(unsigned long)image->device_handle;
 223         unsigned long func;
 224
 225         status = efi_call_early(handle_protocol, handle,
 226                                 &fs_proto, (void **)&io);
 227         if (status != EFI_SUCCESS) {
 228                 efi_printk(sys_table, "Failed to handle fs_proto\n");
 229                 return status;
 230         }
 231
 232         func = (unsigned long)io->open_volume;
 233         status = efi_early->call(func, io, &fh);
 234         if (status != EFI_SUCCESS)
 235                 efi_printk(sys_table, "Failed to open volume\n");
 236
 237         *__fh = fh;
 238         return status;
 239 }
 240
 241 efi_status_t
 242 efi_open_volume(efi_system_table_t *sys_table, void *__image, void **__fh)
 243 {
 244         if (efi_early->is64)
 245                 return __open_volume64(__image, __fh);
 246
 247         return __open_volume32(__image, __fh);
 248 }
 249
 250 void efi_char16_printk(efi_system_table_t *table, efi_char16_t *str)
 251 {
 252         unsigned long output_string;
 253         size_t offset;
 254
 255         if (efi_early->is64) {
 256                 struct efi_simple_text_output_protocol_64 *out;
 257                 u64 *func;
 258
 259                 offset = offsetof(typeof(*out), output_string);
 260                 output_string = efi_early->text_output + offset;
 261                 out = (typeof(out))(unsigned long)efi_early->text_output;
 262                 func = (u64 *)output_string;
 263
 264                 efi_early->call(*func, out, str);
 265         } else {
 266                 struct efi_simple_text_output_protocol_32 *out;
 267                 u32 *func;
 268
 269                 offset = offsetof(typeof(*out), output_string);
 270                 output_string = efi_early->text_output + offset;
 271                 out = (typeof(out))(unsigned long)efi_early->text_output;
 272                 func = (u32 *)output_string;
 273
 274                 efi_early->call(*func, out, str);
 275         }
 276 }
 277
 278 static efi_status_t
 279 __setup_efi_pci32(efi_pci_io_protocol_32 *pci, struct pci_setup_rom **__rom)
 280 {
 281         struct pci_setup_rom *rom = NULL;
 282         efi_status_t status;
 283         unsigned long size;
 284         uint64_t attributes;
 285
 286         status = efi_early->call(pci->attributes, pci,
 287                                  EfiPciIoAttributeOperationGet, 0, 0,
 288                                  &attributes);
 289         if (status != EFI_SUCCESS)
 290                 return status;
 291
 292         if (!pci->romimage || !pci->romsize)
 293                 return EFI_INVALID_PARAMETER;
 294
 295         size = pci->romsize + sizeof(*rom);
 296
 297         status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
 298         if (status != EFI_SUCCESS) {
 299                 efi_printk(sys_table, "Failed to alloc mem for rom\n");
 300                 return status;
 301         }
 302
 303         memset(rom, 0, sizeof(*rom));
 304
 305         rom->data.type = SETUP_PCI;
 306         rom->data.len = size - sizeof(struct setup_data);
 307         rom->data.next = 0;
 308         rom->pcilen = pci->romsize;
 309         *__rom = rom;
 310
 311         status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
 312                                  PCI_VENDOR_ID, 1, &(rom->vendor));
 313
 314         if (status != EFI_SUCCESS) {
 315                 efi_printk(sys_table, "Failed to read rom->vendor\n");
 316                 goto free_struct;
 317         }
 318
 319         status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
 320                                  PCI_DEVICE_ID, 1, &(rom->devid));
 321
 322         if (status != EFI_SUCCESS) {
 323                 efi_printk(sys_table, "Failed to read rom->devid\n");
 324                 goto free_struct;
 325         }
 326
 327         status = efi_early->call(pci->get_location, pci, &(rom->segment),
 328                                  &(rom->bus), &(rom->device), &(rom->function));
 329
 330         if (status != EFI_SUCCESS)
 331                 goto free_struct;
 332
 333         memcpy(rom->romdata, pci->romimage, pci->romsize);
 334         return status;
 335
 336 free_struct:
 337         efi_call_early(free_pool, rom);
 338         return status;
 339 }
 340
 341 static void
 342 setup_efi_pci32(struct boot_params *params, void **pci_handle,
 343                 unsigned long size)
 344 {
 345         efi_pci_io_protocol_32 *pci = NULL;
 346         efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
 347         u32 *handles = (u32 *)(unsigned long)pci_handle;
 348         efi_status_t status;
 349         unsigned long nr_pci;
 350         struct setup_data *data;
 351         int i;
 352
 353         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
 354
 355         while (data && data->next)
 356                 data = (struct setup_data *)(unsigned long)data->next;
 357
 358         nr_pci = size / sizeof(u32);
 359         for (i = 0; i < nr_pci; i++) {
 360                 struct pci_setup_rom *rom = NULL;
 361                 u32 h = handles[i];
 362
 363                 status = efi_call_early(handle_protocol, h,
 364                                         &pci_proto, (void **)&pci);
 365
 366                 if (status != EFI_SUCCESS)
 367                         continue;
 368
 369                 if (!pci)
 370                         continue;
 371
 372                 status = __setup_efi_pci32(pci, &rom);
 373                 if (status != EFI_SUCCESS)
 374                         continue;
 375
 376                 if (data)
 377                         data->next = (unsigned long)rom;
 378                 else
 379                         params->hdr.setup_data = (unsigned long)rom;
 380
 381                 data = (struct setup_data *)rom;
 382
 383         }
 384 }
 385
 386 static efi_status_t
 387 __setup_efi_pci64(efi_pci_io_protocol_64 *pci, struct pci_setup_rom **__rom)
 388 {
 389         struct pci_setup_rom *rom;
 390         efi_status_t status;
 391         unsigned long size;
 392         uint64_t attributes;
 393
 394         status = efi_early->call(pci->attributes, pci,
 395                                  EfiPciIoAttributeOperationGet, 0,
 396                                  &attributes);
 397         if (status != EFI_SUCCESS)
 398                 return status;
 399
 400         if (!pci->romimage || !pci->romsize)
 401                 return EFI_INVALID_PARAMETER;
 402
 403         size = pci->romsize + sizeof(*rom);
 404
 405         status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
 406         if (status != EFI_SUCCESS) {
 407                 efi_printk(sys_table, "Failed to alloc mem for rom\n");
 408                 return status;
 409         }
 410
 411         rom->data.type = SETUP_PCI;
 412         rom->data.len = size - sizeof(struct setup_data);
 413         rom->data.next = 0;
 414         rom->pcilen = pci->romsize;
 415         *__rom = rom;
 416
 417         status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
 418                                  PCI_VENDOR_ID, 1, &(rom->vendor));
 419
 420         if (status != EFI_SUCCESS) {
 421                 efi_printk(sys_table, "Failed to read rom->vendor\n");
 422                 goto free_struct;
 423         }
 424
 425         status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
 426                                  PCI_DEVICE_ID, 1, &(rom->devid));
 427
 428         if (status != EFI_SUCCESS) {
 429                 efi_printk(sys_table, "Failed to read rom->devid\n");
 430                 goto free_struct;
 431         }
 432
 433         status = efi_early->call(pci->get_location, pci, &(rom->segment),
 434                                  &(rom->bus), &(rom->device), &(rom->function));
 435
 436         if (status != EFI_SUCCESS)
 437                 goto free_struct;
 438
 439         memcpy(rom->romdata, pci->romimage, pci->romsize);
 440         return status;
 441
 442 free_struct:
 443         efi_call_early(free_pool, rom);
 444         return status;
 445
 446 }
 447
 448 static void
 449 setup_efi_pci64(struct boot_params *params, void **pci_handle,
 450                 unsigned long size)
 451 {
 452         efi_pci_io_protocol_64 *pci = NULL;
 453         efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
 454         u64 *handles = (u64 *)(unsigned long)pci_handle;
 455         efi_status_t status;
 456         unsigned long nr_pci;
 457         struct setup_data *data;
 458         int i;
 459
 460         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
 461
 462         while (data && data->next)
 463                 data = (struct setup_data *)(unsigned long)data->next;
 464
 465         nr_pci = size / sizeof(u64);
 466         for (i = 0; i < nr_pci; i++) {
 467                 struct pci_setup_rom *rom = NULL;
 468                 u64 h = handles[i];
 469
 470                 status = efi_call_early(handle_protocol, h,
 471                                         &pci_proto, (void **)&pci);
 472
 473                 if (status != EFI_SUCCESS)
 474                         continue;
 475
 476                 if (!pci)
 477                         continue;
 478
 479                 status = __setup_efi_pci64(pci, &rom);
 480                 if (status != EFI_SUCCESS)
 481                         continue;
 482
 483                 if (data)
 484                         data->next = (unsigned long)rom;
 485                 else
 486                         params->hdr.setup_data = (unsigned long)rom;
 487
 488                 data = (struct setup_data *)rom;
 489
 490         }
 491 }
 492
 493 /*
 494  * There's no way to return an informative status from this function,
 495  * because any analysis (and printing of error messages) needs to be
 496  * done directly at the EFI function call-site.
 497  *
 498  * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we
 499  * just didn't find any PCI devices, but there's no way to tell outside
 500  * the context of the call.
 501  */
 502 static void setup_efi_pci(struct boot_params *params)
 503 {
 504         efi_status_t status;
 505         void **pci_handle = NULL;
 506         efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
 507         unsigned long size = 0;
 508
 509         status = efi_call_early(locate_handle,
 510                                 EFI_LOCATE_BY_PROTOCOL,
 511                                 &pci_proto, NULL, &size, pci_handle);
 512
 513         if (status == EFI_BUFFER_TOO_SMALL) {
 514                 status = efi_call_early(allocate_pool,
 515                                         EFI_LOADER_DATA,
 516                                         size, (void **)&pci_handle);
 517
 518                 if (status != EFI_SUCCESS) {
 519                         efi_printk(sys_table, "Failed to alloc mem for pci_handle\n");
 520                         return;
 521                 }
 522
 523                 status = efi_call_early(locate_handle,
 524                                         EFI_LOCATE_BY_PROTOCOL, &pci_proto,
 525                                         NULL, &size, pci_handle);
 526         }
 527
 528         if (status != EFI_SUCCESS)
 529                 goto free_handle;
 530
 531         if (efi_early->is64)
 532                 setup_efi_pci64(params, pci_handle, size);
 533         else
 534                 setup_efi_pci32(params, pci_handle, size);
 535
 536 free_handle:
 537         efi_call_early(free_pool, pci_handle);
 538 }
 539
 540 static efi_status_t
 541 setup_uga32(void **uga_handle, unsigned long size, u32 *width, u32 *height)
 542 {
 543         struct efi_uga_draw_protocol *uga = NULL, *first_uga;
 544         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
 545         unsigned long nr_ugas;
 546         u32 *handles = (u32 *)uga_handle;;
 547         efi_status_t status = EFI_INVALID_PARAMETER;
 548         int i;
 549
 550         first_uga = NULL;
 551         nr_ugas = size / sizeof(u32);
 552         for (i = 0; i < nr_ugas; i++) {
 553                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
 554                 u32 w, h, depth, refresh;
 555                 void *pciio;
 556                 u32 handle = handles[i];
 557
 558                 status = efi_call_early(handle_protocol, handle,
 559                                         &uga_proto, (void **)&uga);
 560                 if (status != EFI_SUCCESS)
 561                         continue;
 562
 563                 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
 564
 565                 status = efi_early->call((unsigned long)uga->get_mode, uga,
 566                                          &w, &h, &depth, &refresh);
 567                 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
 568                         *width = w;
 569                         *height = h;
 570
 571                         /*
 572                          * Once we've found a UGA supporting PCIIO,
 573                          * don't bother looking any further.
 574                          */
 575                         if (pciio)
 576                                 break;
 577
 578                         first_uga = uga;
 579                 }
 580         }
 581
 582         return status;
 583 }
 584
 585 static efi_status_t
 586 setup_uga64(void **uga_handle, unsigned long size, u32 *width, u32 *height)
 587 {
 588         struct efi_uga_draw_protocol *uga = NULL, *first_uga;
 589         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
 590         unsigned long nr_ugas;
 591         u64 *handles = (u64 *)uga_handle;;
 592         efi_status_t status = EFI_INVALID_PARAMETER;
 593         int i;
 594
 595         first_uga = NULL;
 596         nr_ugas = size / sizeof(u64);
 597         for (i = 0; i < nr_ugas; i++) {
 598                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
 599                 u32 w, h, depth, refresh;
 600                 void *pciio;
 601                 u64 handle = handles[i];
 602
 603                 status = efi_call_early(handle_protocol, handle,
 604                                         &uga_proto, (void **)&uga);
 605                 if (status != EFI_SUCCESS)
 606                         continue;
 607
 608                 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
 609
 610                 status = efi_early->call((unsigned long)uga->get_mode, uga,
 611                                          &w, &h, &depth, &refresh);
 612                 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
 613                         *width = w;
 614                         *height = h;
 615
 616                         /*
 617                          * Once we've found a UGA supporting PCIIO,
 618                          * don't bother looking any further.
 619                          */
 620                         if (pciio)
 621                                 break;
 622
 623                         first_uga = uga;
 624                 }
 625         }
 626
 627         return status;
 628 }
 629
 630 /*
 631  * See if we have Universal Graphics Adapter (UGA) protocol
 632  */
 633 static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
 634                               unsigned long size)
 635 {
 636         efi_status_t status;
 637         u32 width, height;
 638         void **uga_handle = NULL;
 639
 640         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 641                                 size, (void **)&uga_handle);
 642         if (status != EFI_SUCCESS)
 643                 return status;
 644
 645         status = efi_call_early(locate_handle,
 646                                 EFI_LOCATE_BY_PROTOCOL,
 647                                 uga_proto, NULL, &size, uga_handle);
 648         if (status != EFI_SUCCESS)
 649                 goto free_handle;
 650
 651         height = 0;
 652         width = 0;
 653
 654         if (efi_early->is64)
 655                 status = setup_uga64(uga_handle, size, &width, &height);
 656         else
 657                 status = setup_uga32(uga_handle, size, &width, &height);
 658
 659         if (!width && !height)
 660                 goto free_handle;
 661
 662         /* EFI framebuffer */
 663         si->orig_video_isVGA = VIDEO_TYPE_EFI;
 664
 665         si->lfb_depth = 32;
 666         si->lfb_width = width;
 667         si->lfb_height = height;
 668
 669         si->red_size = 8;
 670         si->red_pos = 16;
 671         si->green_size = 8;
 672         si->green_pos = 8;
 673         si->blue_size = 8;
 674         si->blue_pos = 0;
 675         si->rsvd_size = 8;
 676         si->rsvd_pos = 24;
 677
 678 free_handle:
 679         efi_call_early(free_pool, uga_handle);
 680         return status;
 681 }
 682
 683 void setup_graphics(struct boot_params *boot_params)
 684 {
 685         efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
 686         struct screen_info *si;
 687         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
 688         efi_status_t status;
 689         unsigned long size;
 690         void **gop_handle = NULL;
 691         void **uga_handle = NULL;
 692
 693         si = &boot_params->screen_info;
 694         memset(si, 0, sizeof(*si));
 695
 696         size = 0;
 697         status = efi_call_early(locate_handle,
 698                                 EFI_LOCATE_BY_PROTOCOL,
 699                                 &graphics_proto, NULL, &size, gop_handle);
 700         if (status == EFI_BUFFER_TOO_SMALL)
 701                 status = efi_setup_gop(NULL, si, &graphics_proto, size);
 702
 703         if (status != EFI_SUCCESS) {
 704                 size = 0;
 705                 status = efi_call_early(locate_handle,
 706                                         EFI_LOCATE_BY_PROTOCOL,
 707                                         &uga_proto, NULL, &size, uga_handle);
 708                 if (status == EFI_BUFFER_TOO_SMALL)
 709                         setup_uga(si, &uga_proto, size);
 710         }
 711 }
 712
 713 /*
 714  * Because the x86 boot code expects to be passed a boot_params we
 715  * need to create one ourselves (usually the bootloader would create
 716  * one for us).
 717  *
 718  * The caller is responsible for filling out ->code32_start in the
 719  * returned boot_params.
 720  */
 721 struct boot_params *make_boot_params(struct efi_config *c)
 722 {
 723         struct boot_params *boot_params;
 724         struct apm_bios_info *bi;
 725         struct setup_header *hdr;
 726         efi_loaded_image_t *image;
 727         void *options, *handle;
 728         efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
 729         int options_size = 0;
 730         efi_status_t status;
 731         char *cmdline_ptr;
 732         u16 *s2;
 733         u8 *s1;
 734         int i;
 735         unsigned long ramdisk_addr;
 736         unsigned long ramdisk_size;
 737
 738         efi_early = c;
 739         sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
 740         handle = (void *)(unsigned long)efi_early->image_handle;
 741
 742         /* Check if we were booted by the EFI firmware */
 743         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 744                 return NULL;
 745
 746         if (efi_early->is64)
 747                 setup_boot_services64(efi_early);
 748         else
 749                 setup_boot_services32(efi_early);
 750
 751         status = efi_call_early(handle_protocol, handle,
 752                                 &proto, (void *)&image);
 753         if (status != EFI_SUCCESS) {
 754                 efi_printk(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
 755                 return NULL;
 756         }
 757
 758         status = efi_low_alloc(sys_table, 0x4000, 1,
 759                                (unsigned long *)&boot_params);
 760         if (status != EFI_SUCCESS) {
 761                 efi_printk(sys_table, "Failed to alloc lowmem for boot params\n");
 762                 return NULL;
 763         }
 764
 765         memset(boot_params, 0x0, 0x4000);
 766
 767         hdr = &boot_params->hdr;
 768         bi = &boot_params->apm_bios_info;
 769
 770         /* Copy the second sector to boot_params */
 771         memcpy(&hdr->jump, image->image_base + 512, 512);
 772
 773         /*
 774          * Fill out some of the header fields ourselves because the
 775          * EFI firmware loader doesn't load the first sector.
 776          */
 777         hdr->root_flags = 1;
 778         hdr->vid_mode = 0xffff;
 779         hdr->boot_flag = 0xAA55;
 780
 781         hdr->type_of_loader = 0x21;
 782
 783         /* Convert unicode cmdline to ascii */
 784         cmdline_ptr = efi_convert_cmdline(sys_table, image, &options_size);
 785         if (!cmdline_ptr)
 786                 goto fail;
 787         hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
 788         /* Fill in upper bits of command line address, NOP on 32 bit  */
 789         boot_params->ext_cmd_line_ptr = (u64)(unsigned long)cmdline_ptr >> 32;
 790
 791         hdr->ramdisk_image = 0;
 792         hdr->ramdisk_size = 0;
 793
 794         /* Clear APM BIOS info */
 795         memset(bi, 0, sizeof(*bi));
 796
 797         status = efi_parse_options(cmdline_ptr);
 798         if (status != EFI_SUCCESS)
 799                 goto fail2;
 800
 801         status = handle_cmdline_files(sys_table, image,
 802                                       (char *)(unsigned long)hdr->cmd_line_ptr,
 803                                       "initrd=", hdr->initrd_addr_max,
 804                                       &ramdisk_addr, &ramdisk_size);
 805
 806         if (status != EFI_SUCCESS &&
 807             hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G) {
 808                 efi_printk(sys_table, "Trying to load files to higher address\n");
 809                 status = handle_cmdline_files(sys_table, image,
 810                                       (char *)(unsigned long)hdr->cmd_line_ptr,
 811                                       "initrd=", -1UL,
 812                                       &ramdisk_addr, &ramdisk_size);
 813         }
 814
 815         if (status != EFI_SUCCESS)
 816                 goto fail2;
 817         hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
 818         hdr->ramdisk_size  = ramdisk_size & 0xffffffff;
 819         boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32;
 820         boot_params->ext_ramdisk_size  = (u64)ramdisk_size >> 32;
 821
 822         return boot_params;
 823 fail2:
 824         efi_free(sys_table, options_size, hdr->cmd_line_ptr);
 825 fail:
 826         efi_free(sys_table, 0x4000, (unsigned long)boot_params);
 827         return NULL;
 828 }
 829
 830 static void add_e820ext(struct boot_params *params,
 831                         struct setup_data *e820ext, u32 nr_entries)
 832 {
 833         struct setup_data *data;
 834         efi_status_t status;
 835         unsigned long size;
 836
 837         e820ext->type = SETUP_E820_EXT;
 838         e820ext->len = nr_entries * sizeof(struct e820entry);
 839         e820ext->next = 0;
 840
 841         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
 842
 843         while (data && data->next)
 844                 data = (struct setup_data *)(unsigned long)data->next;
 845
 846         if (data)
 847                 data->next = (unsigned long)e820ext;
 848         else
 849                 params->hdr.setup_data = (unsigned long)e820ext;
 850 }
 851
 852 static efi_status_t setup_e820(struct boot_params *params,
 853                                struct setup_data *e820ext, u32 e820ext_size)
 854 {
 855         struct e820entry *e820_map = &params->e820_map[0];
 856         struct efi_info *efi = &params->efi_info;
 857         struct e820entry *prev = NULL;
 858         u32 nr_entries;
 859         u32 nr_desc;
 860         int i;
 861
 862         nr_entries = 0;
 863         nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;
 864
 865         for (i = 0; i < nr_desc; i++) {
 866                 efi_memory_desc_t *d;
 867                 unsigned int e820_type = 0;
 868                 unsigned long m = efi->efi_memmap;
 869
 870 #ifdef CONFIG_X86_64
 871                 m |= (u64)efi->efi_memmap_hi << 32;
 872 #endif
 873
 874                 d = (efi_memory_desc_t *)(m + (i * efi->efi_memdesc_size));
 875                 switch (d->type) {
 876                 case EFI_RESERVED_TYPE:
 877                 case EFI_RUNTIME_SERVICES_CODE:
 878                 case EFI_RUNTIME_SERVICES_DATA:
 879                 case EFI_MEMORY_MAPPED_IO:
 880                 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
 881                 case EFI_PAL_CODE:
 882                         e820_type = E820_RESERVED;
 883                         break;
 884
 885                 case EFI_UNUSABLE_MEMORY:
 886                         e820_type = E820_UNUSABLE;
 887                         break;
 888
 889                 case EFI_ACPI_RECLAIM_MEMORY:
 890                         e820_type = E820_ACPI;
 891                         break;
 892
 893                 case EFI_LOADER_CODE:
 894                 case EFI_LOADER_DATA:
 895                 case EFI_BOOT_SERVICES_CODE:
 896                 case EFI_BOOT_SERVICES_DATA:
 897                 case EFI_CONVENTIONAL_MEMORY:
 898                         e820_type = E820_RAM;
 899                         break;
 900
 901                 case EFI_ACPI_MEMORY_NVS:
 902                         e820_type = E820_NVS;
 903                         break;
 904
 905                 case EFI_PERSISTENT_MEMORY:
 906                         e820_type = E820_PMEM;
 907                         break;
 908
 909                 default:
 910                         continue;
 911                 }
 912
 913                 /* Merge adjacent mappings */
 914                 if (prev && prev->type == e820_type &&
 915                     (prev->addr + prev->size) == d->phys_addr) {
 916                         prev->size += d->num_pages << 12;
 917                         continue;
 918                 }
 919
 920                 if (nr_entries == ARRAY_SIZE(params->e820_map)) {
 921                         u32 need = (nr_desc - i) * sizeof(struct e820entry) +
 922                                    sizeof(struct setup_data);
 923
 924                         if (!e820ext || e820ext_size < need)
 925                                 return EFI_BUFFER_TOO_SMALL;
 926
 927                         /* boot_params map full, switch to e820 extended */
 928                         e820_map = (struct e820entry *)e820ext->data;
 929                 }
 930
 931                 e820_map->addr = d->phys_addr;
 932                 e820_map->size = d->num_pages << PAGE_SHIFT;
 933                 e820_map->type = e820_type;
 934                 prev = e820_map++;
 935                 nr_entries++;
 936         }
 937
 938         if (nr_entries > ARRAY_SIZE(params->e820_map)) {
 939                 u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_map);
 940
 941                 add_e820ext(params, e820ext, nr_e820ext);
 942                 nr_entries -= nr_e820ext;
 943         }
 944
 945         params->e820_entries = (u8)nr_entries;
 946
 947         return EFI_SUCCESS;
 948 }
 949
 950 static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
 951                                   u32 *e820ext_size)
 952 {
 953         efi_status_t status;
 954         unsigned long size;
 955
 956         size = sizeof(struct setup_data) +
 957                 sizeof(struct e820entry) * nr_desc;
 958
 959         if (*e820ext) {
 960                 efi_call_early(free_pool, *e820ext);
 961                 *e820ext = NULL;
 962                 *e820ext_size = 0;
 963         }
 964
 965         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 966                                 size, (void **)e820ext);
 967         if (status == EFI_SUCCESS)
 968                 *e820ext_size = size;
 969
 970         return status;
 971 }
 972
 973 static efi_status_t exit_boot(struct boot_params *boot_params,
 974                               void *handle, bool is64)
 975 {
 976         struct efi_info *efi = &boot_params->efi_info;
 977         unsigned long map_sz, key, desc_size;
 978         efi_memory_desc_t *mem_map;
 979         struct setup_data *e820ext;
 980         const char *signature;
 981         __u32 e820ext_size;
 982         __u32 nr_desc, prev_nr_desc;
 983         efi_status_t status;
 984         __u32 desc_version;
 985         bool called_exit = false;
 986         u8 nr_entries;
 987         int i;
 988
 989         nr_desc = 0;
 990         e820ext = NULL;
 991         e820ext_size = 0;
 992
 993 get_map:
 994         status = efi_get_memory_map(sys_table, &mem_map, &map_sz, &desc_size,
 995                                     &desc_version, &key);
 996
 997         if (status != EFI_SUCCESS)
 998                 return status;
 999
1000         prev_nr_desc = nr_desc;
1001         nr_desc = map_sz / desc_size;
1002         if (nr_desc > prev_nr_desc &&
1003             nr_desc > ARRAY_SIZE(boot_params->e820_map)) {
1004                 u32 nr_e820ext = nr_desc - ARRAY_SIZE(boot_params->e820_map);
1005
1006                 status = alloc_e820ext(nr_e820ext, &e820ext, &e820ext_size);
1007                 if (status != EFI_SUCCESS)
1008                         goto free_mem_map;
1009
1010                 efi_call_early(free_pool, mem_map);
1011                 goto get_map; /* Allocated memory, get map again */
1012         }
1013
1014         signature = is64 ? EFI64_LOADER_SIGNATURE : EFI32_LOADER_SIGNATURE;
1015         memcpy(&efi->efi_loader_signature, signature, sizeof(__u32));
1016
1017         efi->efi_systab = (unsigned long)sys_table;
1018         efi->efi_memdesc_size = desc_size;
1019         efi->efi_memdesc_version = desc_version;
1020         efi->efi_memmap = (unsigned long)mem_map;
1021         efi->efi_memmap_size = map_sz;
1022
1023 #ifdef CONFIG_X86_64
1024         efi->efi_systab_hi = (unsigned long)sys_table >> 32;
1025         efi->efi_memmap_hi = (unsigned long)mem_map >> 32;
1026 #endif
1027
1028         /* Might as well exit boot services now */
1029         status = efi_call_early(exit_boot_services, handle, key);
1030         if (status != EFI_SUCCESS) {
1031                 /*
1032                  * ExitBootServices() will fail if any of the event
1033                  * handlers change the memory map. In which case, we
1034                  * must be prepared to retry, but only once so that
1035                  * we're guaranteed to exit on repeated failures instead
1036                  * of spinning forever.
1037                  */
1038                 if (called_exit)
1039                         goto free_mem_map;
1040
1041                 called_exit = true;
1042                 efi_call_early(free_pool, mem_map);
1043                 goto get_map;
1044         }
1045
1046         /* Historic? */
1047         boot_params->alt_mem_k = 32 * 1024;
1048
1049         status = setup_e820(boot_params, e820ext, e820ext_size);
1050         if (status != EFI_SUCCESS)
1051                 return status;
1052
1053         return EFI_SUCCESS;
1054
1055 free_mem_map:
1056         efi_call_early(free_pool, mem_map);
1057         return status;
1058 }
1059
1060 /*
1061  * On success we return a pointer to a boot_params structure, and NULL
1062  * on failure.
1063  */
1064 struct boot_params *efi_main(struct efi_config *c,
1065                              struct boot_params *boot_params)
1066 {
1067         struct desc_ptr *gdt = NULL;
1068         efi_loaded_image_t *image;
1069         struct setup_header *hdr = &boot_params->hdr;
1070         efi_status_t status;
1071         struct desc_struct *desc;
1072         void *handle;
1073         efi_system_table_t *_table;
1074         bool is64;
1075
1076         efi_early = c;
1077
1078         _table = (efi_system_table_t *)(unsigned long)efi_early->table;
1079         handle = (void *)(unsigned long)efi_early->image_handle;
1080         is64 = efi_early->is64;
1081
1082         sys_table = _table;
1083
1084         /* Check if we were booted by the EFI firmware */
1085         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1086                 goto fail;
1087
1088         if (is64)
1089                 setup_boot_services64(efi_early);
1090         else
1091                 setup_boot_services32(efi_early);
1092
1093         setup_graphics(boot_params);
1094
1095         setup_efi_pci(boot_params);
1096
1097         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
1098                                 sizeof(*gdt), (void **)&gdt);
1099         if (status != EFI_SUCCESS) {
1100                 efi_printk(sys_table, "Failed to alloc mem for gdt structure\n");
1101                 goto fail;
1102         }
1103
1104         gdt->size = 0x800;
1105         status = efi_low_alloc(sys_table, gdt->size, 8,
1106                            (unsigned long *)&gdt->address);
1107         if (status != EFI_SUCCESS) {
1108                 efi_printk(sys_table, "Failed to alloc mem for gdt\n");
1109                 goto fail;
1110         }
1111
1112         /*
1113          * If the kernel isn't already loaded at the preferred load
1114          * address, relocate it.
1115          */
1116         if (hdr->pref_address != hdr->code32_start) {
1117                 unsigned long bzimage_addr = hdr->code32_start;
1118                 status = efi_relocate_kernel(sys_table, &bzimage_addr,
1119                                              hdr->init_size, hdr->init_size,
1120                                              hdr->pref_address,
1121                                              hdr->kernel_alignment);
1122                 if (status != EFI_SUCCESS) {
1123                         efi_printk(sys_table, "efi_relocate_kernel() failed!\n");
1124                         goto fail;
1125                 }
1126
1127                 hdr->pref_address = hdr->code32_start;
1128                 hdr->code32_start = bzimage_addr;
1129         }
1130
1131         status = exit_boot(boot_params, handle, is64);
1132         if (status != EFI_SUCCESS) {
1133                 efi_printk(sys_table, "exit_boot() failed!\n");
1134                 goto fail;
1135         }
1136
1137         memset((char *)gdt->address, 0x0, gdt->size);
1138         desc = (struct desc_struct *)gdt->address;
1139
1140         /* The first GDT is a dummy and the second is unused. */
1141         desc += 2;
1142
1143         desc->limit0 = 0xffff;
1144         desc->base0 = 0x0000;
1145         desc->base1 = 0x0000;
1146         desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1147         desc->s = DESC_TYPE_CODE_DATA;
1148         desc->dpl = 0;
1149         desc->p = 1;
1150         desc->limit = 0xf;
1151         desc->avl = 0;
1152         desc->l = 0;
1153         desc->d = SEG_OP_SIZE_32BIT;
1154         desc->g = SEG_GRANULARITY_4KB;
1155         desc->base2 = 0x00;
1156
1157         desc++;
1158         desc->limit0 = 0xffff;
1159         desc->base0 = 0x0000;
1160         desc->base1 = 0x0000;
1161         desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
1162         desc->s = DESC_TYPE_CODE_DATA;
1163         desc->dpl = 0;
1164         desc->p = 1;
1165         desc->limit = 0xf;
1166         desc->avl = 0;
1167         desc->l = 0;
1168         desc->d = SEG_OP_SIZE_32BIT;
1169         desc->g = SEG_GRANULARITY_4KB;
1170         desc->base2 = 0x00;
1171
1172 #ifdef CONFIG_X86_64
1173         /* Task segment value */
1174         desc++;
1175         desc->limit0 = 0x0000;
1176         desc->base0 = 0x0000;
1177         desc->base1 = 0x0000;
1178         desc->type = SEG_TYPE_TSS;
1179         desc->s = 0;
1180         desc->dpl = 0;
1181         desc->p = 1;
1182         desc->limit = 0x0;
1183         desc->avl = 0;
1184         desc->l = 0;
1185         desc->d = 0;
1186         desc->g = SEG_GRANULARITY_4KB;
1187         desc->base2 = 0x00;
1188 #endif /* CONFIG_X86_64 */
1189
1190         asm volatile("cli");
1191         asm volatile ("lgdt %0" : : "m" (*gdt));
1192
1193         return boot_params;
1194 fail:
1195         efi_printk(sys_table, "efi_main() failed!\n");
1196         return NULL;
1197 }